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xen virtual machine 

# facter|grep ^disk
diskdrives => xvda
diskmodel_xvda => Xen Virtual Disk
disksize_xvda => 10485760
disktype_xvda => xvd

SATA 

diskdrives => sda,sdb
diskmodel_sda => SAMSUNG HD403LJ 
diskmodel_sdb => SAMSUNG HD403LJ 
disksize_sda => 781422768
disksize_sdb => 781422768
disktype_sda => scsi
disktype_sdb => scsi

IDE (model is correct, thats what the kernel says) 

diskdrives => hdc
diskmodel_hdc => (none)
disksize_hdc => 7928928
disktype_hdc => ide